Use only TLS 1.2 on OTP vesions < 25

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## Cldr Utils version 2.19.1
+
+This is the changelog for Cldr Utils v2.19.1 released on August 23rd, 2022.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_utils/tags)
+
+**Cldr Utils now requires Elixir 1.11 or later**
+
+### Bug Fixes
+
+* Use only TLS 1.2 on OTP versions less than 25.
+
 ## Cldr Utils version 2.19.0
 
 This is the changelog for Cldr Utils v2.19.0 released on August 22nd, 2022.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_utils/tags)

lib/cldr/http/http.ex

@@ -256,8 +256,11 @@ defmodule Cldr.Http do
   end
 
   def protocol_versions do
-    # Protocols: TLS 1.2, TLS 1.3
-    [:"tlsv1.2", :"tlsv1.3"]
+    if otp_version() < 25 do
+      [:"tlsv1.2"]
+    else
+      [:"tlsv1.2", :"tlsv1.3"]
+    end
   end
 
   def preferred_eccs do
@@ -277,4 +280,7 @@ defmodule Cldr.Http do
     end
   end
 
+  def otp_version do
+    :erlang.system_info(:otp_release) |> List.to_integer
+  end
 end

mix.exs

@@ -1,7 +1,7 @@
 defmodule Cldr.Utils.MixProject do
   use Mix.Project
 
-  @version "2.19.0"
+  @version "2.19.1"
   @source_url "https://github.com/elixir-cldr/cldr_utils"
 
   def project do